Designed for use with PT-MZ16K, PT-MZ13K, and PT-MZ10K LCD laser projectors, the ET-EMW400 15.3-21.1mm Zoom Lens from Panasonic enables you to vary the projection distance by adjusting the focal length. The lens offers a focal range of 15.3-21.1mm and an aperture range of f/1.84-2.24, providing a throw ratio of 0.69-0.95:1 in 16:10 or 16:9 mode and 0.83-1.15:1 in 4:3 mode.